Iowa Constitution
Article III - OF THE DISTRIBUTION OF POWERS.
§ 30 Local or special laws — general and uniform — boundaries of counties.

The general assembly shall not pass local or special laws in the following cases:

For the assessment and collection of taxes for state, county, or road purposes;

For laying out, opening, and working roads or highways; For changing the names of persons;

For the incorporation of cities and towns;

For vacating roads, town plats, streets, alleys, or public squares; For locating or changing county seats.

In all the cases above enumerated, and in all other cases where a general law can be made applicable, all laws shall be general, and of uniform operation throughout the state; and no law changing the boundary lines of any county shall have effect until upon being submitted to the people of the counties affected by the change, at a general election, it shall be approved by a majority of the votes in each county, cast for and against it.

Laws uniform, see this codified Iowa Constitution, Art. I, §6

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